Design for sink



FIG. 1 is a top, front and left side perspective view of a sink showingmy new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a sectional view thereof taken on line 7--7 of FIG. 2; and,

FIG. 8 is a sectional view thereofl taken on line 8--8 of FIG. 2.

The ornamental design for a sink, as shown and described.